Hitachi

JP1 Version 12 JP1/Base User's Guide


14.2.3 Follow-up tasks when changing the system time

If you are using a NTP (Network Time Protocol) server or other method that never sets the system time to a time in the past, you do not need to follow the procedure below to synchronize the system clock. Also, you do not need to stop JP1/Base.

Organization of this subsection

(1) Moving the system time backward

Avoid changing the system time to a past date or time.

Event searches with a specified arrival time might operate incorrectly if you move the system time backward to correct a fast system time, for example.

If you intentionally moved the system time forward for testing purposes or some other reason, follow the steps below to change the system time back again. If JP1/AJS has already started, refer to the changing procedure in the manuals JP1/Automatic Job Management System 3 System Design (Configuration) Guide, JP1/Automatic Job Management System 3 System Design (Work Tasks) Guide, and JP1/Automatic Job Management System 3 Administration Guide.

To change the system time back again:

  1. Stop JP1/IM - Manager.

  2. Stop JP1/Base.

  3. Stop all services that use the startup control.

  4. Change the system time to the current date and time.

  5. Delete the event database by using the jevdbinit command.

  6. Start JP1/Base.

  7. Restart JP1/IM - Manager.

(2) Moving the system time forward to correct a slow system time

You do not need to stop the JP1/Base service to move the system time forward, but you must stop JP1/AJS if it is active. For details on the procedure, see the manuals JP1/Automatic Job Management System 3 System Design (Configuration) Guide, JP1/Automatic Job Management System 3 System Design (Work Tasks) Guide, and JP1/Automatic Job Management System 3 Administration Guide.